Drill-steel retainer



I Aug. 2,1927.

s. M. NELL ET-AL DRILL STEEL RETAINER Filed June 18. 1923 Patented Aug. 2, 1927.

UNITED STATES, ATENT-OF p GUSTAVE M. 1 CLEVELAND ROCK DRILL M 1 V i i V N ELL AND WILLIAM G. KALE, OF CLEVELAND, OHIO, ASSIGN'ORS 'TO THE COMPANY, OF CLEVELAND, OHIO.

DRILL-STEEL RETAINER.

Application filed June 18, 1923.

The present invention is directed to improvements'in drill steel retainers for hammer rock drills.

The primary object of this. invention is to provide a device of this character so constructed that the same can be easily and quickly attached to or removed from the drill to permit renewal and reassembly of the various parts.

A further object of the invention is to provide a steel retainer constructed in such manner that strain and'shocks on the parts are distributed in such a way as to decrease excessive wear and breakage. I

It is a well known fact thatdevices of this kind are subjected to extremely hard usage and a resultant breakage of parts and this construction aims to permit the parts to be moved for replacement, and further the parts are so related that the vibration of the drill positively cannot cause the parts to become accidentally disengaged.

' With these and other objects in view, as will appear as the description proceeds, the invention consists in the novel features of construction, combination of elements, and arrangement of parts, and hereinafter to be fully described and pointed out in the appendedclaims. p I

In the accompanying drawing:

Figure 1 is a side elevation of the device. 7 Figure 2 is a bot-tompl'an view.

Figure 3 is a sideelevation showing the steel retainer in a partiall 1 open position.

Figure 4 is a transverse sectional view.

Figure 5 is a sectional View on .line 5-5 of Fig. 2.

I Referring to the drawing 1 designates the front head of a drill, and in which is rotatably mounted the drill steel 2 having the usual collar '3 thereon, all ofwhich are of the usual construction.

Located upon the sides of the front'head at diametrically opposite points are lugs 4:, said lugs being out of alineinent with the longitudinal aXis of the front head and having their rear sides provided with flat faces 5, the purpose of which will appear later.

The retainer comprises a yoke 6 adapted to straddle the front head, the bight of which provides a loop 7, said loop serving to receive the steel 2. The rear ends of the side arms 8 of the yoke terminate in transverse heads 9, said heads having their rear Serial no. 64 ,032.

sides provided with centrally'located curved seats 10 adapted to engage thefforward 11 of the lugs4 for pivotal movement with respect thereto. These heads are provided with openings 12 in which are slidably engaged paired bolts 13, the integral heads 14 thereof having faces 15, the purpose of which will later appear. Pivotally connected to one bolt 13 of each pair is a lock is provided with a h'ook'17 for detachable engagement with the adjacent bolt. It will bar 16, the free end of which i of course be understood that these bars are prevented from disengaging the'bolts' in one direction by the heads 14, butcan be conveniently placed thereon from the opposite ends. The inner faces of-the 'bars' 1'6 are provided with integral ribs 18 and 19, said ribs being arranged-in obtuse. angularrelation with respect to the longitudinal axis of the bars, whereby the respective ribs will lie in contact with certain faces 15 of the respective heads 14', when the bars are in their locked positions, thereby positively holding the bolts 13 against accidental rotation, as clearly shown in Fig. 4 in "full ines. The forward ends of the bolts 13 are threaded, as at 20, and are threaded in the ends of the connectingbars 21 which are curved longitudinally to accommodate the side arms 8 of the yoke 6. Encircling-each bolt .13 is a coil spring 22, and since these springs are interposed between the heads 9 and bars 21the seats 10 and'bars 16 will yieldably engage the lugs 4 at diametrically opposite points;

The inherent resiliency of the yoke 6"is suflicient to cause the sidetarins8 thereof to yieldably engage the recesses 23 formed in opposite sides of the front headl. These recesses serve in conjunction with the fiat faces'5 as positive means to prevent the yoke from" becoming accidentally openedas will be obvious. To open the retainer it is only necessary to grasp the yoke and swing the same laterally untilthe bars 16 ride from the flat faces 5 of the 11 thereof, thus permitting the retainer to remain open until the drill steel has been changed, after which retainer can be closed upon exerting slight stress thereon in a reverse direction or until the bars 16 return to the flat faces 5 and the'side arms 8 snap into their respective recesses 23.

lugs to the round side's I l "of the ring engagement It willbe obvious that when strain is ap plied to the yoke occasioned bythe collar 3 engaging the loop 7, the yoke will naturally move longitudinally of the head .1 in a forward direction, and consequently thejstrain or shock willbe absorbed by the springs 22.

To disassemble the retainer pressure-is ap- Y plied to the ends 20 of the bolts 13 or to the bars 21, as desired, whereupon the bolts are slid rearwardly a sufficient distance to permit'th'e locking faces 15 of theheads 14: to disengage the "ribs 18-l9, thereby per mitting the bars 16 to be swung tot-heir open positions, as shown in dotted lines in Fig. of "thedrawing, It is then necessary to "the retainer to aposition. substain tially at right anglesfto the front head so that the lugs l can'pass between ,the'heads boltslti, which can be readily accomplished owing to the presence of the flat faces 5. I lowever, inoi'derto accomplish this the heads 14: arefturned so that certain of the locking faces 15' will be in direct alinementfto provide a passage, o sufficient width to permit the lugs pass herethrough. The manner of assembling the retainer will be readily apparent to those skilled in theart. i

What is claimed is: i 1 i y I. In combination with the front head of a rock drill having a collared drill steel pper'atively; mounted therein, lugs upon opposite sides of the front head, drill steel retainer comprising a yoke having i a drill steel engaging loop, the sidearms of the yoke bearing against the front sides of the lugs, pairedbolts slidable. in the side arms and having heads, lock bars pivotallyjcoin nectedtobne bolt of eaclrpair and bearing against the rear sid s of the lugs, means for holding :the side arms and lock bars in yield- A v with the lngs, and-means rri diby e ek r for: e a n t e bolt heads, as and for the purpose set forth. 2, In combination with a front head of a rock drill and a collaredTdr-ill steel rotatable, therein, a "drill steel retainer comprisin agyoke having a steel engaging loop, heade bolts slidable in theside arms of the yoke, lock bars pivotally connected with oertain of the bolts, meansfon :the front head for pivotally connecting the rear end of the side armsand lock .barsto the front head,

of the front head, a

and means carried by the lock bars to engage the heads of the bolts to prevent accidental rotation thereof.

it 3. In combination with the front head of a rock drill and a collared drill steel rotatable therewith, lugs on the opposite sides drill steel retainer having a steel engaging loop and havin its side arm's pivotally engaged with the Inge,

a pair of headed bolts slidable in each of the side arms, lock 'barshav'ingone bf their ends pivotally connected with one bolt of each pair and their other ends 'detachably engaged with the adjacent bolt, said lock bars being also pivotally engagedwit'h the lugs, said lock bars having means thereon for engaging the head of the bolts of each pair to prevent accidentalrot'ation thereof, and means for yieldably holding "the side arms and lock Tbars withthe lugs.

4. In combination with a front head Ora rock'drill having a collareddrill steel spar-1 ating therein, lugs formed on each s idefo'f the front head, a drill steel retaineroom: prising a steel engaging yoke, "the side arms of the yoke having heads ontheir rear ends for engaging the forward sides of't'he lngs, a pair of headed bolts sli-dable in each head, barsconnectingthe forward ends of the bolts of each pair, lock bars having one offtheir ends pivotal'ly engaged with a bolt of each pair and having their other ends provided 35 with hooks for detachably engaging the -adjacent bolts, ribs carried bythe lock-bars for detachably engaging the heads of the bolts, and means carried the bolts holding the heads of the side armsanaieek bars in yielding engagement with the 5 In combination with the i1dntihadtbf a rock drill having a drill steel operati-vely engaged thereimlugs on the front a steel retainer comprising a yoke, lthe'iside arms of which are pivotally engaged with the lugs, a pair of spring restrainedwbolts slidably associated with the side armserthe yoke, and means pivotally engaged with tone of the bolts of each pair for bolts "and each lug to prevent saccidental m tation *ofsaidbolts. I y

i In testimony whereof we have hereunto set our hands. a h a i GUSTAVE WILLIAM G. KATIE, 

